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US 5,379,634 AGranted
Misfire-detecting system for internal combustion engines
AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsShigetaka Kuroda, Kazutomo Sawamura, Yuuichi Shimasaki, Masaki Kanehiro, Takuji Ishioka, Shigeru Maruyama, Yoichi Nishimura, Akira Katoh
Life of this patent
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Abstract
A misfire-detecting system for an internal combustion engine having a plurality of cylinders. A rotational speed of the engine is detected and a rotational speed signal indicative of the detected rotational speed of the engine is output. The rotational speed signal is filtered. Occurrence of a misfire in the engine is determined based on the filtered rotational speed signal.
Claims29
A misfire-detecting system for an internal combustion engine having a plurality of cylinders, comprising:
- engine rotational speed-detecting means for detecting a rotational speed of said engine and for outputting a waveform signal indicative of the detected rotational speed of said engine;
- signal-processing means for filtering said waveform signal to take out a waveform component having a particular frequency range therefrom;
- differentiating means for differentiating said waveform component output from said signal-processing means;
- and
- misfire-detecting means for determining occurrence of a misfire in said engine by comparing an output from said differentiating means with a predetermined reference value.
2 more elements
A misfire-detecting system for an internal combustion engine having a plurality of cylinders, comprising:
- engine rotational speed-detecting means for detecting a rotational speed of said engine and for outputting a rotational speed signal indicative of the detected rotational speed of said engine;
- signal-processing means for filtering said rotational speed signal to take out a particular frequency component therefrom;
- differentiating means for differentiating an output from said signal-processing means;
- and
- misfire-detecting means for determining occurrence of a misfire in said engine by comparing an output from said differentiating means with a predetermined reference value, wherein said signal-processing means comprises at least one of a low-pass filter for allowing components of said rotational speed signal lower than a first setting frequency thereof to pass therethrough and a high-pass filter for allowing components of said rotational speed signal higher than a second setting frequency thereof to pass therethrough.
2 more elements
A misfire-detecting system for an internal combustion engine having a plurality of cylinders, comprising:
- engine rotational speed-detecting means for detecting a rotational speed of said engine and outputting a rotational speed signal indicative of the detected rotational speed of said engine;
- first signal-processing means for taking out a first particular frequency component from said rotational speed signal and outputting a first signal;
- second signal-processing means for taking out a second particular frequency component from said rotational speed signal and outputting a second signal having a predetermined amount of difference in phase from said first signal;
- third signal-processing means for combining said first signal and said second signal to output a third signal;
- and
- misfire-determining means for determining occurrence of a misfire in said engine by comparing a value of said third signal from said third signal-processing means with a predetermined reference value.
3 more elements
A misfire-detecting system for an internal combustion engine having a plurality of cylinders, comprising:
- engine rotational speed-detecting means for detecting a rotational speed of said engine and outputting a rotational speed signal indicative of the detected rotational speed of said engine;
- first signal-processing means for taking out a particular frequency component from said rotational speed signal and outputting a first signal;
- second signal-processing means for taking out a particular frequency component from said rotational speed signal and outputting a second signal;
- phase-adjusting means for adjusting a phase of said second signal;
- amplifying means for amplifying an output from said phase-adjusting means;
- third signal-processing means for combining said first signal and an output from said amplifying means to output a third signal;
- and
- misfire-determining means for determining occurrence of a misfire in said engine by comparing a value of said third signal from said third signal-processing means with a predetermined reference value.
5 more elements
A misfire-detecting system for an internal combustion engine having a plurality of cylinders and a crankshaft, comprising:
- engine rotational speed-detecting means for detecting a rotational speed of said engine whenever said crankshaft rotates through a predetermined angle and for outputting a waveform signal indicative of the detected rotation speed of said engine;
- filter means for taking out a waveform component having a particular frequency range from said waveform signal and for outputting a signal;
- differentiating means for differentiating said waveform component output from said filter means and for outputting an output;
- and
- misfire-determining means for determining occurrence of a misfire in said engine by comparing an output from said differentiating means with a predetermined reference value.
2 more elements
A misfire-detecting system for an internal combustion engine having a plurality of cylinders and a crankshaft, comprising:
- engine rotational speed-detecting means for detecting a rotational speed of said engine whenever said crankshaft rotates through a predetermined angle and for outputting a rotational speed signal indicative of the detected rotational speed of said engine;
- filter means for taking out a predetermined frequency component from said rotational speed signal and for outputting a signal, wherein said filter means comprises a low-pass filter for allowing components of said rotational speed signal lower than a first setting frequency thereof to pass therethrough and a high-pass filter for allowing components of said rotational speed signal higher than a second setting frequency thereof to pass therethrough;
- differentiating means for differentiating an output from said filter means and for outputting an output;
- difference-calculating means for calculating a difference between a present value of said output from said differentiating means and an average value of immediately preceding values thereof;
- misfire-determining means for determining occurrence of a misfire in said engine by comparing an output from said difference-calculating means with a predetermined reference value.
2 more elements
A misfire-detecting system for an internal combustion engine having a plurality of cylinders and a crankshaft, comprising:
- engine rotational speed-detecting means for detecting a rotational speed of said engine whenever said crankshaft rotates through a predetermined angle and outputting a rotational speed signal indicative of the detected rotational speed of said engine;
- filter means for taking out a predetermined frequency component from said rotational speed signal and outputting a signal;
- correcting means for correcting the output from said filter means according to a filtering characteristic of said filter means;
- and
- misfire-determining means for determining occurrence of a misfire in said engine by comparing a value of said signal from said filter means with a predetermined reference value.
2 more elements
A misfire-detecting system for an internal combustion engine having a plurality of cylinders and a crankshaft, comprising:
- engine rotational speed-detecting means for detecting a rotational speed of said engine whenever said crankshaft rotates through a predetermined angle and outputting a rotational speed signal indicative of the detected rotational speed of said engine;
- filter means for taking out a predetermined frequency component from said rotational speed signal and outputting a signal;
- and
- misfire-determining means for determining occurrence of a misfire in said engine by comparing a value of said signal from said filter means with a predetermined reference value,
- wherein said misfire-determining means includes setting means for setting said predetermined reference value depending on a state of engagement between said engine and a driving system of a vehicle on which said engine is installed.
2 more elements
A misfire-detecting system for an internal combustion engine having a plurality of cylinders and a crankshaft, comprising:
- engine rotational speed-detecting means for detecting a rotational speed of said engine whenever said crankshaft rotates through a predetermined angle and outputting a rotational speed signal indicative of the detected rotational speed of said engine;
- filter means for taking out a predetermined frequency component from said rotational speed signal and outputting a signal;
- and
- misfire-determining means for determining occurrence of a misfire in said engine by comparing a value of said signal from said filter means with a predetermined reference value,
- wherein said misfire-determining means includes setting means for setting said predetermined reference value depending on whether a vehicle on which said engine is installed is a manual transmission type or an automatic transmission type.
2 more elements
A misfire-detecting system for an internal combustion engine having a plurality of cylinders and a crankshaft, comprising:
- engine rotational speed-detecting means for detecting a rotational speed of said engine whenever said crankshaft rotates through a predetermined angle and outputting a rotational speed signal indicative of the detected rotational speed of said engine;
- filter means for taking out a predetermined frequency component from said rotational speed signal and outputting a signal;
- and
- misfire-determining means for determining occurrence of a misfire in said engine by comparing a value of said signal from said filter means with a predetermined reference value,
- wherein said misfire-determining means includes setting means for setting said predetermined reference value according to a filtering characteristic of said filter means.
2 more elements
A misfire-detecting system for an internal combustion engine having a plurality of cylinders and a crankshaft, comprising:
- engine rotational speed-detecting means for detecting a rotational speed of said engine whenever said crankshaft rotates through a predetermined angle and outputting a rotational speed signal indicative of the detected rotational speed of said engine;
- filter means for taking out a predetermined frequency component from said rotational speed signal and outputting a signal, said filter means includes a low-pass filter for allowing components of said rotational speed signal lower than a first setting frequency thereof to pass therethrough and a high-pass filter for allowing components of said rotational speed signal higher than a second setting frequency thereof to pass therethrough;
- and
- misfire-determining means for determining occurrence of a misfire in said engine by comparing a value of said signal from said filter means with a predetermined reference value.
1 more element
A misfire-detecting system for an internal combustion engine having a plurality of cylinders and a crankshaft, comprising:
- engine rotational speed-detecting means for detecting a rotational speed of said engine whenever said crankshaft rotates through a predetermined angle and outputting a rotational speed signal indicative of the detected rotational speed of said engine;
- filter means for taking out a predetermined frequency component from said rotational speed signal and outputting a signal, said filter means includes a low-pass filter for allowing components of said rotational speed signal lower than a first setting frequency thereof to pass therethrough and a high-pass filter for allowing components of said rotational speed signal higher than a second setting frequency thereof to pass therethrough;
- and
- misfire-determining means for determining occurrence of a misfire in said engine by comparing a value of said signal from said filter means with a predetermined reference value, said misfire-detecting system including changeover means for selecting for use between said high-pass filter and said low-pass filter according to said rotational speed of said engine.
1 more element
A misfire-detecting system for an internal combustion engine having a plurality of cylinders and a crankshaft, comprising:
- engine rotational speed-detecting means for detecting a rotational speed of said engine whenever said crankshaft rotates through a predetermined angle and outputting a rotational speed signal indicative of the detected rotational speed of said engine;
- filter means for taking out a predetermined frequency component from said rotational speed signal and outputting a signal;
- and
- misfire-determining means for determining occurrence of a misfire in said engine by comparing a value of said signal from said filter means with a predetermined reference value,
- wherein said misfire-determining means includes misfire cylinder-determining means for determining a cylinder in which a misfire has occurred, based upon a time lag due to a filtering characteristic of said filter means.
2 more elements
A misfire-detecting system for an internal combustion engine having a plurality of cylinders, comprising:
- engine rotational speed-detecting means for detecting a rotational speed of said engine and outputting a rotational speed signal indicative of the detected rotational speed of said engine;
- signal-processing means for filtering said rotational speed signal to take out a particular frequency component therefrom;
- and
- misfire-determining means for determining occurrence of a misfire in said engine by comparing an output from said signal-processing means with a predetermined reference value,
- wherein said misfire-determining means includes misfire cylinder-determining means for determining a cylinder in which a misfire has occurred, based upon a time lag due to a filtering characteristic of said signal-processing means.
2 more elements
Dependencies are inferred from the claim text.